Projectile-fuse time-train ring.



W. J. HAWKINS.

' .FROJECTILE FUSE TIME TRAIN RING.

APPLICATION FILED MAY 7| I917.

1,233,466. Patented July 17, 1917.

WILIEORD HUDSON HAWKINS, OF MONTCLAIR, NEW JERSEY.

PROJEGTILE-FUSE TIME-TRAIN RING.

Specification of Letters Patent.

Patented July 1'3, 1591?.

Application filed may 7, 1917. Serial No. 16?,0-35.

To all whom it may concern:

Be it known that I, NIL one J UDSON HAW- KINS, 1 citizen of the United States, residing at Montclair, county of Essex, and State of New Jersey, have invented a new and useful Improvement in Projectile-F use Time-Train Rings, of which the following is a specification.

This invention relates to an improvement in projectile fuse time train 'rings.

In the time train rings for dial type fuses used heretofore, it has been customary to provide powder grooves having parallel walls the grooves being open to the rear of the ring or toward the body of the projectile. The powder is inserted in the ring groove under heavy pressure. found that after a time a tendency exists for the powder to become loose in'the ring groove. It has been'further found that the jar of gun fire and projectile acceleration to which the powder is subjected tends to produce displacement, or disintegration, or both, of the powder in the ring groove. Such dis placement or disintegration results in a changein the time burning of the fuse which is at variance with that pro-determined. In the use of high velocity projectiles, this variable and uncertain burning--due to the causes mentioned-is highly objectionable because a variation of a small fraction of a second in fuse burning results in a relatively large time range variation during projeo tile flight. And where, as in present practice, great accuracy. 13 essential in such mechanisms, this defect is a serious one.

The main object of the present invention is to overcome this defect of projectile fuse time train rings in order that greater accuracy may be attained.

As before stated, the powder is inserted in the time train ring groove under heavy pressure, and it has been found that this pressure results in spreading the walls of the grooves slightly. This spreading, tends to increase the tendency of the powder to be displaced or disintegrated. Another object of the'invention therefore is the production of a time train ring having converging retaining walls undercut to resist displacement and disintegration of the powder during gun fire and projectile acceleration, the converging inclination of said walls being in excess of any possible spreading of said walls during powder loading, so that even if It has been train ring constructed in accordance with.

the invention; Fi 2 1s a cross-sectional View taken on the line 2 2 in Fig. 1; and Figs. 3 and 4 are fragmentary views illustrating modified forms of grooves.

In carrying the invention into effect, there is provided a projectile fuse time train ring provided with a device for resisting displace" ment and disintegration of the powder carried thereby during gun fire and projectile acceleration. In the best construction, the ring is provided with a powder groove having undercut retaining walls which are con verging, the converging inclination of. said walls being in excess of any possible spreading of said walls during powder loading.

The device selected to illustrate the invention is but one of many possible concrete einbodiments of the same, and the invention therefore is not to be restricted to the precise details of the structure shown and described.

Referring to the drawings, 5 indicates a projectile fuse time train. ring generally of well known c .aracter but provided with. a

owder groove 6 having a rounded bot om an inner retaining wall 8, and an outer retaining wall 9, said walls being undercut and converging, as clearly shown in As before stated, the loaz'iling of the powder into the ring groove ordinarily results in a slight spreading of the walls of groove. In the present device, the. converging inclination of the walls 8 and 9 is therefore designed to be in excess of any possibl spread-- ing; or in other words, to still resist displacement and disintegration of the powder within the groove even when a slight spreading of the walls occurs. The ring further provided with a llashhele 10, the purpose ice During gun fire and projectile acceleration, there is of course a tendency of the powder Within the groove to he set back toward the face of the ti e traim ring mounted behind the one here shown, as in the old devices. It will be readily understood, however, that the converging retaining walls 8 and 9 resist prevent this set back movement, and therefore prevent the objectionable displacement and disintegration formerly due to such set back movement together with its attendant time changing efi'ect. A

In the modification shown in Fig; 3, the inner and outer walls are parallel at 11 and 12, but undercut and converging at 13 and 14, while the bottom 15 of the groove is flat.

In the modification shown in Fig. 4, the inner wall 16 and the outer wall 17 are undercut and converging, while the bottom l 18 of the groove is substantially fiat but rounded slightly at its junction with the walls. Other forms of grooves not shown but I capable of efl'ecting the desired result may of course be used in place of the preferred form shown in Figs. 1 and 2, or. either of H the modified forms shown in Figs. 3 and 4%.

What is claimed is: Y

1. Aprojcctile fuse time train ring provided' with a powder groove open to the rear and having retaining walls undercut to resist displacement and disintegration of the powder during gun fire and projectile acceleration. i

. ,2. A projectile fuse time train ring provided with a powder groove open to the projectile acceleration, the converging inclination of said Walls being in excess of any possible spreading of said walls during powder loading.

d. A projectile fuse time train ring provided with a powder groove having a rounded nottom and retaining walls undercut to resist displacement and disintegration of the powder during gun fire and pr0- jectile acceleration.

In testimony whereof, I have signed my name to this specification.

VVILFORD J UD SON HAWKINS; 

